Because Djokovic won the early match at the O2 Arena in straight sets, Murray needed only to win one set to ensure his passage. And he got that easily, breaking Tsonga's serve in the first and third games en route to a 4-0 lead.

Murray had another early break in the second set, but Tsonga got it back to even the score at 3-3 and eventually force the tiebreaker.

Murray (2-1) finished second in Group A, while Djokovic (3-0) was first.

The ATP finals is the last tournament of the season, and only for the top eight players in the world. In Group B, six-time champion Roger Federer has already qualified for the semifinals and will face Juan Martin del Potro in his final group match on Saturday. David Ferrer is also in the group and can still qualify for the semifinals, but Janko Tipsarevic has been eliminated.

Before coming to London, Djokovic lost in the second round of the Paris Masters, and said after that match that he felt down physically. But against Berdych, the top-ranked Serb ran all over the court, retrieving ball after ball and making his opponent work hard on nearly every point.

"If you are winning matches, I mean, obviously you feel better," Djokovic said. "But still, I mean, the fact is that it being the last tournament of the year here in London for most of the players, it is a challenge finding that last drop of energy, physical, mental, to find their best game and go as far as they can."

Djokovic, who reclaimed the No. 1 ranking at the beginning of the week, broke his Czech opponent twice in the first set and once in the second, though he was broken right back on the third occasion to force the tiebreaker.

Berdych then had his opportunities to win the second set, leading 5-1 and 6-3 in the tiebreaker, but he wasted all three of his set points as Djokovic won five straight to close out the match.

"I had some chances in the tiebreak," said Berdych, who was eliminated from the tournament with a 1-2 record. "If I would be able to make it, try to push him for the third set, then maybe get another chance. But this would be just if. It didn't happen."

Berdych has only beaten Djokovic once in 12 tries, and that came two years ago on grass in the Wimbledon semifinals. On hard courts, Djokovic is now 10-0 against the hard-hitting Czech.

Besides playing tennis and winning tournaments, Djokovic has also had his father's health on his mind. On Friday, the top-ranked Serb said his father was getting better but didn't give any detail as to what the problem is.

"Well, every win means a lot for my family and me," Djokovic said. "But there are more important things in life, and that's health. I guess that's the priority now."

Despite bowing out from the ATP finals, Berdych still has more tennis to play this season. He will lead the Czech Republic against Spain next week in the Davis Cup final.

"It's another week, another event, another big thing. So I will try to get ready for that again," Berdych said. "I hope that the best moment is still to come."

Mahesh Bhupathi, left and Rohan Bopanna of India celebrate their 5-6, 6-1, 12-10 victory against Leander Paes of India and Radek Stepanek of the Czech Republic. Bhupathi and Bopanna are into the final.
Glyn Kirk, AFP/Getty Images

Roger Federer of Switzerland delivers a little fist pump on his way to a 6-4, 7-6 (7-5) victory against David Ferrer of Spain on Thursday to secure a spot in the semifinals of the ATP World Tour Finals in London.
Clive Brunskill, Getty Images

Leander Paes of India and Radek Stepanek of the Czech Republic do an on-court dance on their way to a 7-5, 6-4 victory against Spanish duo Marc Lopez and Marcel Granollers.
Ben Stansall, AFP/Getty Images

Tomas Berdych of the Czech Republic delivers a fist pump after delivering a 7-5, 3-6, 6-1 victory against Jo-Wilfried Tsonga of France on Day 3 of the ATP World Tour Finals.
Carl Court, AFP/Getty Images

Max Mirnyi of Belarus smacks a forehand during a doubles loss, with Daniel Nestor of Canada, to Jonathan Marray of Britain, top left, and Frederik Nielsen of Denmark. Marray and Nielsen won 7-6 (7-2), 4-6, 12-10
Glyn Kirk, AFP/Getty Images

Jo-Wilfried Tsonga of France, Janko Tipsarevic of Serbia, Andy Murray of Britain, Roger Federer of Switzerland, Novak Djokovic of Serbia, Juan Martin del Potro of Argentina and Tomas Berdych of the Czech Republic are seven of the eight men who qualified for the ATP World Tour Finals. David Ferrer, the eighth, won the Paris Masters leading into the season finale.
Julian Finney, Getty Images